The standard reduction potentials, Eo for the half reactions are: Zn2+ + 2e- → Zn ; Eo = -0.76 V Fe2+ + 2e- → Fe ;  Eo = -0.41 V What is the standard emf of the cell involving the following reaction? Fe2+ + Zn → Zn2+ + Fe

-0.35 V +1.17 V +0.35 V -1.17 V

+0.35 V

E0cell = E0Fe2+/Fe - E0Zn2+/Zn          = -0.41 - (-0.76) = -0.41 + 0.76 = 0.35 V